N54: The best Plugs, Injectors and Coils Thread
- Thread starter doublespaces
- Start date
I just got my BimmerlifeTuning coils this weekend. Im installing them tomorrow.
Alex with BL has said theyve tested them up to .031, but recommend. 026 for longevity.
I'm running the PR at .031" and overcharging them to test longevity in real world, but I'd agree. .022" to .026" is good for high power. I've only seen gap issues/loss of power on these cars when you get around .017" or smaller. Large gaps create very high voltage and can lead to internal arcing in the coil which reduces its life, or the carbon tracking a couple people have seen on the PR when the couple cm air gap around the plug is actually EASIER to bridge than the .031" gap in the plug in the cylinder (always use dielectric grease with any performance coil).
So i installed them, opened the gaps to .026. Took about 30min. Could be done in 5 if you dont mess with gaps. Went to gas station and filled with e60, changed the tune, reset a couple adaptations, and went for a ride. No misfires, no timing corrections except post shift (6at), afrs seem normal at about 12.3-4 ish. Cant tell if i feel power gains or not cause im focusing on too much other crap, but im glad i dont have any misfires (yet) because this map use to give me some high rpm misfires. Probably pulls a little harder. Definitely not less. I have no baseline dyno, but ill be able to tell if it took any time off my 1/4 et. That is if i get back to the track this season. Anyway, not a bad deal, looks badass, solves some issues. Oh and engine cover doesnt fit very well..... lol
Good deal other than the engine cover. Surprised it doesn't fit well. Thought there would be a problem with the PR's but figured the BL's would have no issue with the cover.
I really didn't mess with it much. Probably just move the harness a little bit ans it will go in nicely
Cool! Instant results, that's awesome. I'd be curious to know if anyone else has issues with putting the cover on.
Is it true that smart coils don't work well with 2 step colder plugs?
I just got the m4 plugs NGK97506. Going to run it with Delphi coils.
I just got the m4 plugs NGK97506. Going to run it with Delphi coils.
anyone ? Any truth to this ?? If so, why would there be an issue using 2 step colder ?
I have BL coils and my cover fit fine. Although I had to grind out a notch for my second HPFP line.
I have the BL coils, the cover does take a bit more to fit, I think you've got to get the harness out of the way in the back left. Right now it doesn't sit all the way down but I have to readjust some things and I think it will work.
Been running the same BMW OEM Eldor coils on my Z4 for over 2 years now, 500 whp. Also many of our customers with upgraded twins run the Eldor coils and one ST 335is in the 650s running the Eldor coils also with no issues. All cars with the Eldor coils are running NGK plugs.
I second the eldor coil recommendation. Bosch coils would fail one by one every other month it seemed. Did a third gear pull and 3 misfires were reported by the dme. Im 25 psi 6266 methanol injected. Ngk 95770 gapped to .018. Misfires were also common when pushing enough so meth would flow and rapidly getting off of the gas. Now that i fit eldors there are no more misfires.
Yeah, Bosch tends to fail pretty easily if you are pushing it. I blew two with just some spilled oil on the valve cover from a oil change.
Best plugs:
Stock if you're under 400 whp and don't feel like messing with gaps, N20 for any other application (AKA N55/S55 plugs)
Best Coils:
Not gonna touch the BL / PR debate (read at your own leisure) but the best OEMs are Eldor no questions about it
Best Injectors:
Index 12s ending in PN -937 AKA S63 injectors
https://blog.fcpeuro.com/difference-between-direct-fuel-injector-13538648937-and-13538616079
Stock if you're under 400 whp and don't feel like messing with gaps, N20 for any other application (AKA N55/S55 plugs)
Best Coils:
Not gonna touch the BL / PR debate (read at your own leisure) but the best OEMs are Eldor no questions about it
Best Injectors:
Index 12s ending in PN -937 AKA S63 injectors
https://blog.fcpeuro.com/difference-between-direct-fuel-injector-13538648937-and-13538616079
Since I put new Bosch coils in over a year ago, I have yet to have one fail. Dont see how some of you guys are going through them so fast.
